- Schneider Electric Square D™ Mounting Plate, Microperforated, For Use With: Special S3D/Special CRN/Special S3X Steel Wall Mounting Enclosure and Thalassa™ PLM Polyester Wall-Mounting Enclosure, Specifications: 2.5 mm THK, Galvanized Steel, 765 mm W x 125 mm D x 1165 mm H Dimensions